| Home |
Background |
Model Setup |
Model Run Movies |
Model Analysis |
Discussions and Conclusions |
Stage 1: Valley Flow
|
|
| Location
of Data Points Used in Stage 1 Analyses |
|
| Contours depict velocity magnitude
and vectors depict velocity direction. Highest velocity occurs at the toe
along the center axis of the valley, with 0 velocty along the walls where
the Flubber is coupled. |
|
|
|
|
|
|
|
|
Virtually no velocity gradient in x-direction
with the exception of the front lobe of the glacier where the red bulls-eye
region shows a very small component of lateral compression due to interaction
between the shape of the valley and the Flubber toe.
|
Two regions
of high velocity gradient in the y- direction are evident. A region
of extension (blue) at the top of the image is where the y-component of
velocity increases due to the increase in surface slope from the low-angle
reservoir region to the higher-angle (20º) valley. At the toe
of the glacier there is a region of compression (red) due to a deceleration
of the toe, which causes the Flubber to fold over itself as observed in the
movies. |
As expected
from the movie observations, the plot shows a region of 0 shear strain
rate along the center y-axis of the glacier, with the opposite sense of
shear on either side due to coupling with the valley walls.
Positive vs. negative shear along the two walls is simply related to axes
orientation. |
|
|
|
|
|
| Minimal dilatation with
no obvious patterns. |
Plot shows counterclockwise
rotation along the right-hand wall (looking up-valley) and clockwise rotation
along the left-hand wall due to high velocity down the center axis and
coupling with the valley walls. |